ZOOLOGY — m'CIvUNG, MORSE, PATTEN. 283 



ings of the chromosomes. The species in the genera are distinguish- 

 able by variations in size of the chromosomes and other cell parts. 

 Corroborative evidence is afforded by other families of the Orthop- 

 tera. The results so far would indicate that the chromosomes are 

 highly organized, self-perpetuating elements of constant sizes and 

 relationships in the different species. Sufficient data have not been 

 accumulated to establish anj^ relationship between a particular 

 chromosome and a group of somatic characters. The hypothesis 

 that the accessory chromosome governs the development of the male 

 germ cells seems more probable as the work progresses, and forms a 

 possible exception to the preceding statement. 



Morse, Albert P., Wellesley, Massachusetts. Grant No. 284. Re- 

 search on North American Acridiid<z , with especial reference to 

 biology, distribiitio?i, and variation. (Continuation of Grant 

 No. 84.) $1,000. 



Abstract of Report. — The work consists thus far of a field-work 

 trip of ten weeks' duration, July 5 to September 13. At the begin- 

 ning of the year it. was planned to make a general reconnoissance 

 of the next group of States to the west of the area studied in 1903, 

 viz, Tennessee, Mississippi, Alabama, Arkansas, and Louisiana. 

 After two weeks in the field it became necessary, owing to the 

 interruption to travel caused by the outbreak of yellow fever, to 

 postpone examination of this region until a more favorable time. 

 The remainder of the reason was spent in western Arkansas, Indian 

 Territory, Oklahoma, and northern Texas. The material collected, 

 comprising several thousand specimens, is being prepared for study, 

 and a full report will be submitted when it has been examined. 



Patten, William, Dartmouth College, Hanover, New Hampshire. 



Grant No. 157. hivesti gallons relating to the origin of vertebrates . 



(For first report see Year Book No. 3, p. 140.) $500 • 



A report of the field work accomplished in New Brunswick during 

 the summer of 1904 has been submitted. All the large slabs and 

 nodules containing those specimens of Bothriolepis, the finding of 

 which was the special object of the expedition, are now uncovered or 

 completely removed from the matrix. This material is more abun- 

 dant and in a more perfect condition of preservation than any of a 

 similar nature that has ever been obtained before. It enables us 

 for the first time not only to reproduce the external shape and 

 structure of the body of these remarkable animals down to the mi- 

 nutest details, but to learn also something of their internal anatomy. 

 It also gives us a most vivid picture of the daily life of these animals 



