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RESEARCHES ON FUNGI 



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second ^ and third contacts Avcrc made as the spore crossed the 



second and the third Hnes 



respectively. Thus for 



the fall of each spore the 



3^^ o ^ pen deviated three times 



from its normal path on 

 ^ 5 ttj the paper of the drum 



(Fi^s. 60 and 01). The 



5 V cS ' "" » fall of about 100 spores 



o n !r: ^^,^g recorded in this way 

 as rapidly as possible, the 

 entire record usually be- 

 ing completed in less than 

 fifteen minutes. A time 

 record of ten seconds was 



I j '-T •? S ^2 always made on the drum 



before and after each 



series of observations by 



means of a chronometer 



L^- [ -^ ^ - ticking half-seconds. The 



drum kept up a very con- 

 stant peripheral velocity, 

 which was usually TIG 

 cm. per second. When the 

 records had been made, 

 they were measured off 

 on the drum by means of 

 r I ^ Ma steel tape, added up, and 



the average taken. By 

 I measuring the distance 



run by the drum in ten seconds, the speed of the drum could be 



determined. The average length of time represented by the average 



^ There was no absolute necessity to record the passinf^f of the middle line by 

 a spore, but it was found convenient to do so for the purpose of distin^ijuishing 

 the individual spore-rucords from one anotlier on tlio drum. Every ett'ort was 

 made to make the lirst and third contacts precisely at the times tlie upper and 

 lower lines were bein<f crossed ; but the second contact, beiuij of quite secondary 

 importance, was naturally not always recorded so accurately. Tlie middle line 

 was 2'22 mm. from the upper line and 2'33 mm. from the lower line. 



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