Scientific Proceedings. 0^9) 19 



To settle this question, morphology gives us little help. 

 Although the organism of this case resembles the descriptions of 

 the morphology as well as the photographs, of the spirillum of 

 Obermeier, in practically all respects, it must be remembered that 

 the spirillum of geese is strikingly similar to that of Obermeier, 

 and yet, in the animal reactions, the anserina may be sharply dif- 

 ferentiated from that of Obermeier, as it is not infective for monkeys. 



The organism of this case, like Obermeier' s, is infective for 

 monkeys. The following differences have, however, been noted : 

 The disease transmitted to the monkeys that were inoculated by the 

 author seems to have been much milder than the experimental spi- 

 rillum infection of those animals, as reported by various observers. 

 Relapses in monkeys have rarely been noted ; by one observer, in 

 only one out of eight cases. Other observers seem never to have 

 observed relapses. In the author's experience, each of three mon- 

 keys has had relapses, the first Rhesus having already had three. 



Dr. Ewing has also called the author's attention to the fact that 

 the spirochetas of this case, as seen in the blood of the inoculated 

 monkeys, as well as in the human blood, is similar to Spirochete 

 refringens. 



Such a case directs attention to the probability of mild spiro- 

 chetal infections, more or less constantly occurring, in sailors or 

 travelers coming from southern climates into the port of New 

 York. The author also called attention to the possibility that in- 

 fection may be communicated, from person to person, through the 

 bites of ticks and bed-bugs, and through wounds. 



5 (97). " The chromosomes in relation to the determination 

 of sex in insects " : EDMUND B. WILSON. 



Material procured during the past summer (1905) demonstrates 

 with great clearness that the sexes of Hemiptera show constant 

 and characteristic differences in the chromosome groups, which are 

 of such a nature as to leave no doubt that a definite connection of 

 some kind between the chromosomes and the determination of sex 

 exists in these animals. These differences are of two types. In 

 one of these, the cells of the female possess one more chromosome 

 than those of the male ; in the other, both sexes possess the same 

 number of chromosomes, but one of the chromosomes in the male 



