728 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



Entomologists' annual. 



Flora and sylva. 



Forstlicho bliiltcr. 



Forstlicho niitthoilungon. 



Jahresbericlit iiber die crfahrungen und fortsohritte auf dem gesamtgebiete der 

 landwirtschaft. 



Klosternouberg bei Wien, K.K. Chemisch-physiologische vereuchsstationfiir wein- 

 und obslbaii in. Mitthoilungen. 



Natuurkundig tijdschrift voor Nederkind.sch Indiiv 



New Zealand institute. Transactions and proceedings. 



Le progros V('t('rinaire. 



Revue bryoltigitiue. 



Revue d'hygidne et de police sanitaire. 



Zeitschrift f iir wiasenschai'tliche zoologie. 



Zentralblatt f iir die gesamte physiologic. 



Zentralblatt fiir stoffwechscl- und verdauungskrankheiten. 



PERIODICALS. 



The periodicals cuiTcntly received diirino; the year numbered 2,002 

 different titles, exclusive of annuals and other serials of infrequent 

 issue. The number of new titles added during the year was 136. 

 Of the total number of periodicals received 768 were purchased and 

 1,234 received by gift and exchange. To the number of different 

 periodicals purchased should be added 65 duplicates, making a total 

 of 803 periodicals purchased. In the number of gifts and exchanges 

 are included 305 publications of state departments and experiment 

 stations, which, though not properly called periodicals, are neverthe- 

 less of frecjuent issue and are entered and circulated at the periodical 

 desk in the same manner as the periodicals. If these 305 publications 

 are deducted from the total number of periodicals currently received, 

 namely, 2,002, it leaves 1,697 regular periodicals. A large proportion 

 of the exchanges are received in duplicate, greatly adding to the 

 amount of material handled. A count was made of the number of 

 current unbound periodicals handled daily from May 7 to June 6, 1910, 

 which, compared with a similar count made for May, 1909, is as 

 follows: 



New numbers received and recorded . 



Daily average 



Returns from circulation 



Daily average 



May. 1909 

 (25 days). 



4,523 

 ISl 



4,731 

 189 



May 7 to 

 June 6, 1910 

 (25 days). 



4,923 

 197 



5,104 

 204 



It is impossible to keep a complete record for the whole year of 

 the circulation of current periodicals, but the above statement of 

 the circulation for a single month gives some idea of the growth 

 of the work. The figures do not, however, give any adequate idea of 

 the real circulation of the current periodicals. They represent 

 little more than the circulation to bureaus and offices and do not for 

 the most part include the circulation to individuals in those offices. 

 For example, a periodical that is charged by us once at the periodical 

 desk to the Bureau of Plant Industry hbrary may circulate to fifteen 

 or twenty individuals in the Bureau of Plant Industry before it is 

 returned to the main Library. 



