38 



SCIENCE. 



[N. S. Vol. XXIII. No. 575. 



arose from having neglected to study in cer- 

 tain species the phenomena of the second re- 

 duction mitosis. 



The preceding observations apply only to 

 the spermatogenesis. Wilson has recently 

 shown that in Anasa tristis, Protenor hel- 

 fragei and Alydus pilosidus there is one less 

 chromosome in the spermatogonia than in the 

 ovogonia, and from this most important ob- 

 servation has dravpn interesting conclusions 

 relating particularly to the determination of 

 sex. Before the receipt of this last note by 

 Wilson I had determined that this is the case 

 in Anasa sp. also. 



These observations vs^ith further ones on 

 other families will be detailed in a later pub- 

 lication. A point to which I would again 

 draw attention is the value of chromosomal 

 relations as a tasonomic character, discussed 

 in a preceding paper, and within a few months 

 reiterated by McClung. The number of the 

 chromosomes is less constant than relations 

 of behavior. All the Coreidse have one mono- 

 some and a pair of diplosomes; the monosome 

 divides in the first maturation division, prob- 

 ably equationally, but never in the second; 

 the diplosomes conjugate in the growth period 

 of the spermatocytes, remain united until they 

 become separated by a reduction division in 

 the first maturation mitosis, then each divides 

 equationally in the second. The Pentatomidse 

 possess no monosomes; all have one pair of 

 diplosomes (Trichopepla possibly two), which 

 regularly conjugate in the early growth period, 

 later separate, each divides equationally in 

 the first maturation division, they conjugate 

 again in the second spermatocyte and there 

 this bivalent diplosome becomes reductionally 

 divided. Thus one family has only diplo- 

 somes, the other these as well as a monosome; 

 in the one the diplosomes divide first equation- 

 ally, then reductionally, while in the other 

 family the sequence of the divisions is just 

 the reverse. 



The conviction almost forces itself upon 

 one that chromosomal relations not only fur- 

 nish the basis for any understanding of the 

 processes called heredity and differentiation. 



but also bid fair to become the basis of 

 taxonomy. Thos. H. Montgomery, Jr. 



November 24, 1905. ' _ 



SCIENTIFIC NOTES AND NEWS. 



The American Association for the Advance- 

 ment of Science and six affiliated societies are 

 meeting in New Orleans as we go to press. 

 We hope to publish next week the official re- 

 port of the meeting. Reports of the societies 

 meeting with the association at New Orleans 

 and of those meeting in Ann Arbor, New 

 York and elsewhere will follow as soon as 

 possible. Professor Dr. W. H. Welch, pro- 

 fessor of pathology at the Johns Hopkins 

 University, has been elected president of the 

 association. 



Professor William James, of Harvard Uni- 

 versity, has been elected president of the 

 American Philosophical Association. 



Professor James E. Angell, of the Univer- 

 sity of Chicago, has been elected president of 

 the American Psychological Association. 



M. Henri Moissan, professor of chemistry 

 at Paris, has been elected a foreign member 

 in the Munich Academy of Sciences, and Dr. 

 Warburg, the president of the Reichsanstalt, 

 and Dr. Karl Chunn, professor of zoology at 

 Leipzig, have been elected corresponding 

 members. 



Mr. Otto Veach has been appointed state 

 geologist of Georgia. 



Dr. Max Uhle, who for the past seven years 

 has been engaged in archeological research in 

 Peru as the head of the Hearst Expedition for 

 the University of California, has concluded 

 the field work of the Hearst Expedition and 

 has accepted the position of director of the 

 National Archeological Museum of Peru. In 

 a letter received from Dr. Max Uhle he states 

 that the government of Peru will prohibit the 

 exploration of archeological sites by foreign- 

 ers, unless under the direction of the govern- 

 ment, and will also prohibit all exportation of 

 archeological objects after January 1, 1906. 



We learn from The Botanical Gazette that 

 Dr. J. C. Arthur, of Purdue University, is 

 preparing the manuscript on the plant rusts 

 of North America for the ' North American 



