636 SUMMARY OF CURRENT RESEARCHES RELATING TO 



occurs at times. The leucocytes assist in producing the milk, and some 

 of them pass into the secretion us Nissl's corpuscles, where they cannot 

 be distinguished from the corpuscles of epithelial origin. In certain 

 cases, e.g. the guinea-pig, the different parts of the gland arc not all 

 simultaneously functional. In the cow, resistant bodies recalling the 

 corpora amylacea of the prostate occur, and with them phagocytes are 

 found, which have a destructive action on the bodies. 



Histiochemistry of Cartilage.* — Dr. Alfred Moll finds that Tanzer's 

 solution (orcein) differentiates between embryonic cartilage and other 

 embryonic tissues, and between embryonic cartilage and adult cartilage. 

 It stains embryonic intercellular substance blue and adult red, except 

 such structures as the cartilage capsules, which seem to remain in their 

 embryonic condition. 



Nerve-endings in Lymphatics of Mammals.j — K. A. Kytmanof 

 finds that the lymphatics are rich in nerves and nerve-endings, the nerves 

 being chiefly non-medullated. They form reticuli of four types : — 

 (1) the adventitial reticulum, (2) the supramuscular reticulum, (o) the 

 intermuscular reticulum, (4) the wub-endothelial reticulum. Sensory 

 nerve-endings are present both in the tunica adveatitia and in the tunica 

 media, and the unstriped muscle-fibres of the tunica media have also 

 free motor nerve-endings. In general, the innervation of the lymphatics 

 closely resembles that of the arteries. 



Degeneration of Nerve-cells in Guinea-pig. :[ — - M. Miihlmann has 



studied the; minute structure of the nerve-cells of the guinea-pig at 

 different ages, in order to ascertain whether there arc any changes corre- 

 sponding to those which occur in man with advancing age. He finds 

 that in this case also globules of fat make their appearance in the cells, 

 differing from those of man only in that they are not associated with 

 pigment. The process is one of partial fatty metamorphosis ; it does 

 not involve the whole cell, and does not appear to lead to the death of 

 the cells. 



Nerve-endings in Arteries. § — A. W. Eachmanow finds that Vater- 

 Pacinian corpuscles are present in the tunica adventitia of the aorta in 

 man and mammals, and probably in the coat of the other great vessels 

 as well. 



Structure of Blood-plates (Thrombocytes). — Dr. M. C. Deklmyzen,}; 

 Fr. Kopsch,^[ and P. Argutinsky,** in three separate papers, confirm and 

 amplify the discovery made independently by the first-named and by 

 Deetjen, that the blood-plates are amoeboid nucleated cells. Dekhuyzen 

 has studied the blood in a number of animals, and finds that in worms, 

 Echinoderms, Mollusc*, Crustacea, and Vertebrates, inchrding Mammals, 

 there are cells of similar type and function. These cells are amoeboid, 

 finely granular, and spindle-shaped, with oval nuclei ; in circulating 

 blood the surface is smooth, but the cells are readily injured, and, on 

 quitting the vessels, produce slender amoeboid protoplasmic lamella-, 



* Arch. Mikr. Anat., lviii. (1901) pp. 4S3-G (1 pi.). 

 + Anat. Anzeig., xix. (1901) pp. 3(i'.t-77 (0 pis.). 



X Tom. cit., pp. 377-83 (3 ti^s.). § Tom. cit., pp. 555-8 (1 pi. and 2 figs.). 

 Ij Tom. cit,, pp. 529-40 (7 figs.). 1 Tom. cit.. pp. 541-51 (5 figs.). 



*• Tom. cit.. pp. 552-4. 



