ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 39 



Specific Substances In Leucocytes of Immunized Animals. — 

 Alois Bachmann {C. E. Soc. Biol, 1919, 82, 1031-3). A study 

 of the leucocytes of guinea-pigs immunized against Eberth's bacilli 

 reveals the presence of specific substances which can be isolated. To 

 these substances the leucocytes owe their specific immunizing power. 

 The substances are more stable products than the endolysins. Indeed, 

 they were experimentally isolated by the destruction of the endolysins > 

 a method which left the specific substances intact. J. A. T. 



" Patty Cells " of Pulmonary Alveolus. — E. Faur^-Fremiet 

 {C. R. Soc. Biol, 1920, 83, 11-13). In the pulmonary alveolus of ox, 

 cat, rat, and other forms " fatty cells " have been described. The 

 ■delicate conjunctive- vascular support of the wall of the alveolus is 

 •covered on each surface with an epithelium of non-nucleated flat cells 

 .and of nucleated globular cells. The nucleated globular cells contain 

 lipoid globules, which appear to be in great part due to cholesterin. As 

 the result of slight irritation these elements multiply and may become 

 mobile phagocytes. If they become free they lose the lipoid inclusions 



J. A. T. 



Blood Corpuscles of Camelidse. — J. Jolly (C. R. Soc. Biol, 1920, 

 83, 125-7). The blood of a Llama showed regularly oval red blood 

 ■corpuscles, 8 /x, by 4 /x, without trace of nucleus. Seen in profile they 

 looked Hke spindles. They are delicate lamellae, but when they float 

 they show a marked tendency to roll themselves up on their longitu- 

 dinal axis. J. A. T. 



Haversian Systems in Membrane Bone. — Leslie B. Arey {Anat. 

 Record, 1919, 17, 59-61, 2 figs.). Sections from bones like the parietal 

 and temporal controvert current statements as to the absence of 

 Haversian systems in membrane bone. These erroneous statements 

 have helped to perpetuate a false histological distinction between bones 

 primarily of intracartilaginous and bones primarily of intramembranous 

 origin. The fact is that in the arrangement of bone tissue into 

 periosteal. Haversian, and interstitial lamellag there is essential archi- 

 tectural uniformity, irrespective of the mode of development. 



J. A. T. 



Minute Structure of the Brain. — Gr. Fuse {Arh. Anat. Inst. K, 

 Japan Univ. Sendai, 1919, 2, 1-384, 218 figs.). A series of researches 

 on the minute structure of various parts of the brain in man and 

 mammals. They deal, for instance, with the medulla oblongata, the 

 trigeminal root, the corpus trapezoides, the zona quinto-olivaris superior, 

 and the auditory tracts. J. A. T. 



Lateral Line of Polyodon spathula. — Homer B. Latimer {Trans. 

 Amer. Micr. Soc, 1919, 38, 189-206, 2 pis.)- As the lateral canal 

 passes backwards from the gill region its diameter gradually becomes 



