990 



SCIENCE 



[N. S. Vol. XXXVir. No. 965 



characterize as truly Gallic dogmatism. In 

 regard to the relative importance of humoral 

 and phagocytic factors in immunity state- 

 ments of the most sweeping nature are made. 

 So we read on page 205: "Are the opsonins 

 substances or properties new and unknown be- 

 fore Wright's researches? Numerous experi- 

 ments ascribe to the opsonins of normal serum 

 the same properties as characterize the com- 

 plement. They are products of the leucocytes." 

 And again on page 227 : " There are only two 

 ' theories,' that of Ehrlich and that of Bordet, 

 which, with their conjectures, their uncer- 

 tainty, their attempts at explanation, and 

 their continual state of incompleteness, are 

 striving to round oil the positive doctrine, the 

 expression of undoubted facts, namely, phago- 

 cytosis." "It is no way of recognizing the 

 capital importance of phagocytosis to admit 

 that anti bodies and other humoral properties 

 are produced by the phagocytes. The essential 

 fact is the destruction of the microbes by in- 

 corporation and digestion. Extraphagocytic 

 destruction is so much an exceptional case 

 that it can not even be brought in as opposi- 

 tion." 



The illustrations are for the most part crude 

 line drawings of the type found only in 

 French texts. The English translation is 

 somewhat unfortunate, abounding in construc- 

 tions like the following (from p. 171) : " To 

 prepare an anti-endotoxin, as in the prepara- 



Eed black ? 



X 

 Pink gray c? 



Red gray 2 



X 

 Pink black (J 



tion of an antitoxin, it is necessary to inject 

 several times into an animal, for example, the 

 horse, the toxic substance, in this case the bac- 

 terial bodies, entire or broken up " ; so that 

 the reader is almost reminded of the fate of 

 the famous jumping frog after his translation. 

 into French and back again. 



C.-E. A. WiNSLOW 



SPECIAL ABTICLES 



A THIRD GROUP OF LINKED GENES IN DROSOPHILA 

 AMPELOPHILA 



The existence of a group of sex-linked 

 genes in Drosophila ampelophila which are 

 linked to each other in diilerent degrees has 

 been demonstrated by Morgan in numerous 

 papers ('10, '11, '12) and by Sturtevant 

 ('13). The fact that the black and vestigial 

 factors, which are not sex-linked, are linked 

 to each other, was reported by Morgan and 

 LjTich ('12) and by Morgan ('12), and these 

 genes were considered as lying in the " sec- 

 ond chromosome." The present paper pre- 

 sents evidence showing the existence of still 

 another group of genes, which are located in 

 the " third chromosome." 



The pink-eyed fly, first described by Mor- 

 gan ('11), has been shovsTi (Morgan, '11, '12) 

 to behave as an ordinary Mendelian recessive 

 to the normal red. That this factor is inde- 

 pendent of those in the second chromosome is 

 shown by the following experiments: 



red gray ^ and $ s 



red gray ^ and ? 



fred gray 

 I red black 

 ) pink gray 

 pink Dlack 



Fi red gray $ from above 



X 

 Pink black cJ 



Vestigial red $ 

 X 



Long pink (J 



^r^^ 



long red (J and ? 



'long red 717 



long pink 268 



vestigial red 136 



vestigial pink 50 



