256 NATURAL SCIENCE. October. 



Dwight (123), Ehlers (23), Gratiolet (131), Cavanna (109), Traill (206), 

 Tyson (208), and Vrolik (210) give some details concerning it. The 

 arch of the aorta and its branches are described or figured by nearly 

 all the above writers, their observations being brought together 

 by Keith (147). The arterial and venous systems have been recorded 

 in a very fragmentary way. Barkow's figures (90) give much better 

 information as to their distribution than any other record ; but a good 

 deal concerning the arteries may be obtained from Bischoff (99), 

 Chapman (m), Dwight (123), Ehlers (23), Gratiolet (131), Humphry 

 (142), and Sutton (201). Ruge (189) described the relationships of 

 the pericardium, while Gulliver (135) has made a study of the size of 

 the red blood corpuscles. 



The Lymphatic System and Ductless Glands. — There has as 

 yet been no proper investigadon of this system. The spleen has 

 scarcely been more than mentioned — Bischoff (99), Gratiolet (131), 

 Symington (202), and Tyson (208). The thyroid has been remarked 

 upon only by Bischoff (99), and Ehlers (23), and, so far as I know, no 

 work has been done upon the lymphatic system or upon the thymus. 



The Genito- Urinary System. — The external genitals of young 

 female animals have been figured or described by Bischoff (6, 99), 

 Chapman (m), Gratiolet (131), Hartmann (42), Barkow (90), 

 Hoffmann (141), Symington (202), and Traill (206); the external 

 genitals of the male by Duvernoy (22), Barkow (90), and Tyson (208) ; 

 Crisp (114) has made observations on the os penis. The external 

 genitals are of surprisingly small development ; but it must be kept in 

 mind that they have been studied upon animals, for the greater part, 

 quite immature, or, if adult, upon subjects contracted by long 

 immersion in alcohol. The uterus and internal organs of the female 

 are described by Hoffmann (141), Symington (202), Gratiolet (131), 

 Bischoff (6, 99), and Traill (208). So far as I know, Bolau (23) is the 

 only one who has observed menstruation in the chimpanzee. The 

 prostate, vesicula seminales, and bladder are figured by Barkow (90), 

 Tyson (208), and Humphry (142), while in the section given by 

 Cunningham (118) the situation and relationships of the pelvic 

 organs of the male are very well brought out. There has been no 

 good examination of the kidney made, most of the authors already 

 mentioned in this section merely remarking casually upon it. 



The Organs of Sense. — The eye of " Mafuca " was examined 

 with some minuteness by Hirschberg (58) ; Gratiolet (131) and Traill 

 (206) also give some details concerning it. Zuckerkandl (216) has 

 described the turbinate region of the nasal cavities {see also references 

 under tongue, p. 12, for the organ of taste, and under references 

 170, 150, and 89, for organs oi touch). 



External Characters, Configuration, and Proportions. — Many 

 contributions to this part of the literature on the chimpanzee have 

 been accompanied by very fine illustrations, such as those with the 

 papers by Beddard (93), Bartlett (91), Nissle (170^), Hermes (139a), 



