The early development of the mammalian embryo belongs to a period which, for the student, provides the particularly deep fascination connected with the processes of germination of the fIrst tender buds of life. Moreover, developmental biology encompasses a very large part of biology; if broadly dermed - almost all of it. The same is true for the fIeld of pathology if the manifold possibilities of disorders of the orderly arranged pathways of developmental processes are considered. Normal development in its earliest steps - and it would be diffI cult to see it otherwise - means the functioning...

Immunology, in all its facets of immunochemistry, humoral immunity, cellular immunity, immunodiagnosis, and immunotherapy, is currently the most rapidly advancing discipline of clinical and experimental oncology. But as in most developing subjects, it is continually beset with problems of methodology and nomenclature, both of which are often intertwined. Indicative of this problem are our circular definitions of antigen and antibody. Another fre quent problem is the use of the words "specific" and "associated" when characterizing re actions to tumors or the antigenic properties of neoplasms....

In 1967 cardiologists in Switzerland were struck by the sudden increase in the number of cases of so-called primary pulmonary hypertensive disease (PPHD). Up untill966, the cardiology centers in Switzerland had not seen more than one or two cases a year, but this number suddenly multiplied by ten or twenty times. At the June 1968 meeting ofthe Swiss Society of Cardiology, Gurtner et al. (1968b) presented a paper which raised the question whether the vascular types of cor pulmonale had increased. They also raised the question about the possible responsibility of environmental factors, such as...

(North American) Blastomycosis is caused by the dimorphic fungus Blastomyces dermati- tidis, first described by Gilchrist andStokes in 1896. The perfect stage was grown by Mc- Donough and Lewis in 1967 and is known as Ajellomyces dermatitidis. In the body and on appropriate media at 37 C, the organism presents itself as a round, thick-walled budding yeast cell, characteristically with a broad porus between mother and daughter cells. The yeast cell is multinucleated. For many years, North America was assumed to be the only place where blastomycosis was found, but recent demonstration of...

1. Concepts on the Causal Genesis of Human Intestinal Tumors The action of chemical substances has a significant role in the genesis of human tumors. It is assumed that most human tumors are induced by exogenous chemical noxae (Schmahl, 1970;Heidelberger, 1975; and others). In the course of intensive efforts to discover the principles of tumor etiology, important insights have resulted in recent years. These are that chemical carcinogens do not only arise as products of our tech nological civilization, but that they also occur in nature as potent solitary carcinogens and cocarcinogens (e. g.,...

The morphological behaviour of leucocytes* leaving the blood has been studied for more than a hundred years and can be described in some detail, but the mechanisms involved are for the most part still unclear. Following an inflammatory stimulus, dy- namic changes occur in small blood vessels near the inflamed site and are followed by margination of leucocytes and by their adherence to the endovascular surface of endo- out of the vessel in the gaps between endothelial thelial cells. The leucocytes migrate cells and move towards the noxious stimulus, directed presumably by chemotactic gra-...

Few subjects in gynecology, let alone in medicine in general, have provoked such inter est or study as cervical cancer. Although the wealth of monographs and books publish ed on the subject would seem to obviate the need for more, the great advances made in the medical sciences and in gynecological experience and techniques in recent years call for, if not require, a new book on cervical cancer to bring together the latest ideas and trends in its methods of study, diagnosis, and treatment. Although precancerous lesions have become more common, the number of women developing invasive cervical...

The enormous importance of the diseases of the locomotor system in all populations and the large component of general clinical practice which they represent have not, in the past, been matched by an appropriate pathological effort. Increasing expectation of an active and long life has resulted in a great increase in specialisation in Rheumatology and rehabilitation of those with crippling diseases. This volume presents many of the pathological advances that have followed this clini cal interest, beginning with reviews of changes in biological materials obtained by in vasive investigation of...