1905] LIVINGSTON—TRANSPIRATION AND GROWTH 193 
times as much of the chemical. No. 4 is a nutrient solution exactly 
like no. 1 but freshly made. No. 5 is the used nutrient solution with 
manure extract added. The cultures lasted from October 11 to 
November 8, 1904. The transpiration was taken for 17 days, from 
October 22 to November 8. 
ot A photograph of 
\78we the series is shown in 
eo OS ~2I given in fig. 19. The 
oe itn sia We first three cultures 
ie ra “ier “ter - show practically the 
: 3 4 5 same weights and leaf 
areas, and nos. 2 and 
3 show about equal transpirations. The transpiration numbers for 
nos. 2 and 3 are somewhat greater than that for no. 1. Nos. 3, 
4, and 5 show about the same rela- 
tion to each other by all three cri- 
teria, transpiration, weight, and area. 
In other words, the transpiration is 
surprisingly high in the two cultures 
containing pyrogallol. In some way 
this substance usually accelerates 
growth of roots, and this may explain 
the discrepancies above referred to. 
The question here brought up will 
be deferred to a future time. 
Series XIV.—This consists of 
soil extracts all made by the method 
described by Wurrney and CAME- 
RON (loc. cit.). No. 1 is an extract 
of the poor Takoma soil used in sae 
Series I, etc., but which had been used for the growth of wheat 
before for a period of twenty days. No. 2 is of the same extract 
freshly made with addition of one part per million pyrogallol. No. 
3 is the same as the last without pyrogallol; and no. 4 is ale, 
but with addition of manure extract instead of the chemical. The 
Period is the same as that for Series XIV. 
