100 HATCH EXPERIMENT STATION. [Jan. 



of the college, in charge of the experiment station, author- 

 ized the entomological division of the station to inspect nur- 

 series when requested to do so by their owners, and to give 

 authorized certificates where no scale is found, charging for 

 this work only the actual expenses incurred. This action 

 was not a required one, and was taken solely for the purpose 

 of accommodating nurserymen, many of whom have already 

 shown their appreciation of the arrangement and have availed 

 themselves of the opportunity thus afibrded them. 



Bulletin on Chionaspis. 

 On the 10th of August, 1899, the work of Mr. R. A. 

 Cooley on the different species of Ohionaspis and Hemi- 

 chionaspis was published in a special bulletin of the station. 

 This bulletin, treating of many of the important scale insects 

 which have recently attracted so much attention because of 

 the injury they do to fruit and other trees, was fully illus- 

 trated, and has received high commendation not only in this 

 country but also in Europe. 



The Grass Theips. 

 Studies on the grass thrips have been continued during the 

 year by Mr. W. E. Hinds, one of the senior students, with 

 most satisfactory results, and are published as an appendix 

 to the college catalogue. As these studies are largely tech- 

 nical, such of the facts as have an economic bearing will also 

 be published in a bulletin for the use of the farmers of the 



State. 



The Clover-head Beetle. 



Work on the clover-head beetle {PJiytonomus nigrirostris) 

 has been continued during the year by Mr. C. M. Walker, 

 and the results are nearly ready for publication. Its life 

 history has been nearly completed, and the best methods of 

 treatment are being investigated. This work will be pub- 

 lished as soon as completed. 



Raupenleim. 



This substance, which is of such value for banding trees 

 liable to the attacks of the canker worms, tussock moth, etc., 

 has heretofore been manufactured by a secret process in Ger- 



