BY F. P. SANDES. 387 



javmuca, Sore.c vul(/aris, and Tarsius spectrum. Honore, too, in 

 the rabbit, working in the same way, arrived at the same general 

 conclusions as Sobotta and Stratz; and van der 8tricht, working 

 on ovaries of VesperfUio iiuiriinis, V. pipistrelhis, Plecofus auritjii^, 

 and Vesperu(/o 7ioctn^a, from which an abundance of material was 

 obtained, confirms Bischofi"s theory. Van Beneden in the rabbit, 

 Belloy in the guinea pig and rat, Heape in the monkey, Bouin 

 in the rat and guinea pig, Bonnet in the dog, and Cornil and 

 Kreis in man, have all arrived at a similar conclusion, though 

 differing in minor points. Of these authors, Sobotta, van der 

 Stricht, Honore and Stratz may be taken as examples of those 

 who have founded their support of Bischoff's theory on the stud}^ 

 of a sufficient series of ovaries to give them all tlie stages of 

 corpus luteum formation, particularly the early ones. On the 

 other hand, it is found' that the upholders of von Baer's theory, 

 famous anatomists though some of them be, have studied this 

 question in an imperfect way. His, Kolliker, Rabl, Nagel, 

 Paladino, Clark, Doering, and Biihler have lately come forward 

 as opponents of Bischoif's theory. With the excejDtion of Biihler, 

 whose work is not yet complete, none of them have carried out a 

 study of the corpus luteum in all its stages of development, or at 

 any rate there is no record of their having done so. Therefore 

 their statements do not bear so much weight as they otherwise 

 would. It is only fair to state that, with regard to His and 

 Kolliker, their more recent remarks on this subject were made in 

 short discussions at Anatomical Congresses. Rabl admits that 

 his material is not sufficient to be of great service in settling this 

 question, whilst Nagel's opinion is expressed but shortly in von 

 Bardeleden's "Anatomie.'' Paladino's recent contribution to 

 this question is founded on old observations made without respect 

 to more recent requirements. In the case of Doering and Clark, 

 they have collected swine ovaries (in large numbers, it is true), 

 but without reference to any data as regards oestrum, time of 

 coitus, and stage of pregnancy; or if any, so that they have no 

 certain knowledge of the actual stages of corpus luteum they have 

 described. 



