152 BOTANICAL GAZETTE. [ July, 
i ide by gummed paper. From the weight, y, the 
ier py ete er 6, in the groove cut for it, and aii 
the recording needle. This, as shown in £, . bares 
needle heated and bent, and inserted in a block 0 os " i 
is grooved for the supporting threads. The poin Me 
needle should be blunted, and the sides filed flat to pr 
turning. Of course ¢ and y must balance each ot “ aa 
From the plant 7 around whose tip it is looped, t ene 
& takes a complete turn around @ and is just kept taut by 
touching d makes e a magnet, which draws up. is wie 
ture, ~, releasing the pin o and allowing the cylinder i 
volve. The armature is released the next instant and ti the 
in time to stop the next pin. By this partial revolt ae 
needle makes a horizontal line. The record of a aheipasrts 
: from 3 Pp. M. to near 11 is shown in 5S. ae Ol 
When the needle has risen to the top of the cylinae ae 
paper may be slit along the line of union, removed et! hey 
mersed in a solution of white shellac in alcohol. Wher died 
the soot can not be rubbed off and the record may be st 
and compared with others. k, will 
The total cost of the apparatus, including the aie on 
be from $10 to $15, according to the amount of work pulUr” 
it. The results are entirely satisfactory. 
