1917] 
HARRIS & LAWRENCE—TISSUE FLUIDS 
291 
A portion of the foregoing species are sclerophyllous and a 
portion are succulent-leaved plants. 
The tissues of the Cactaceae, 
which are the dominant forms on the coastal flats, yield fluids 
giving the following values: 
Cactus Melocactus L. 
anuary 22, for cortex, A=o.40, P=4.9 
for pith, A=o0.49, P=5.9 
March 30, A=o0.46, P=5.5 
April 
2, 
Cephalocereus Swartzii (Griseb.) Britton and Rese 
March 30, for cortex, A=o.59, P=7.1 
for pith, A=o.70, P=8.5 
April 2, - cortex, A=o.59, P=7.1 
ith, A=o0.69, P=8.3 
an gracilis (Mill. Britton 
March 26, for cortex, A=o.53, P=6. 
Hylocereus triangularis (Mill.) Britton and Rose 
January 25, A=o0.48, P= 
Lemairocereus Hystrix (Solm Byck) Britton and Rose 
f 
or cortex, A=o0.64, P= 
for pith, A=0.75, P=9.0 
January 25, for cortex, A=o.44, P=5.2 
for pith, A=0.64, P=7.7 
A=0.64, P=7.6 
March 30, for cortex, A=o.53, P=6.3 
for pith, A=o0.57, P=6.9 
April 2, for cortex, A=o.80, P=9.7 
for pith, A=o0.76, P=9.1 
March 26, 
Opuntia Dillenii (Ker Gawl.) Haw. 
January 25, A=o.57, P=6.8 
March 30, A=o.75, P=9.0 
April 2, A=o.69, P=8.3 
Opuntia spinosissima Mill. 
6.8 
March 26, A=o.78, P= 9.4 
8.6 
I 
April 2, A=o.93, P=11. 
The only monocotyledonous plant studied was the terrestrial 
Bromelia, which may be included here 
Bromelia Pinguin L 
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March 26, A=0.63, P=7.6 
