196 COX. 
often requires an experienced eye to recognize it. Sometimes 
when mixed with a small quantity of sand it will be unnoticed by 
the ordinary observer. In nearly every cave in the Philippines 
the dirty granular solid on the floor, varying from a few centi- 
meters to a meter or more in depth, is bat guano. Chemical 
analyses do not distinguish between different kinds of guano. 
The principal fertilizer ingredients of guano are nitrogen, phos- 
phorie anhydride, potash, and organic matter. Aside from 
moisture and organic matter, nitrogen and phosphoric anhydride 
are the most abundant constituents. The composition of Phil- 
ippine guano is shown by the following more or less complete 
analyses of the Bureau of Science. 
TABLE I.—Chemical analyses of Philippine guanos. 
i) E S Phosphoric acid | ey 
Labo- cs) ; ao Lo. Se es 
ratory Date. Source and remarks. 9 5 a= ahs t 
0. 5 bh | 8 O12) || Con excer 
| £|23| 3 | 33] #3 (See 
S = |e 3 3 | Sa | & 
=) a a & = a2/Oa 
1007 1903 Unknown; bat guano ____- 24.14 | 7.28 | 1.86 |------- 0520) |22eeee 0.91 
1030 LSOS es | See ee dose sats ee 33.63 | 6.47 | 0.6 |------- OMNES 0.50 
2498 1904 Mining Bureau sample 
IN'OF 18-6) 22es he te | Peeeeee Bz5 10 Saeee 4,28 |_=.2..|c2- 222] eee 
1422 | July 28,1903 | Caveon Guimaras Island__|_______ 14S} Eee 12.50 | 2.30 | 4.80 1.53 
5846 | Oct. 31,1904 | Unknown (fine) ---------_|______- 2.48 |_----- R11 |. 2 252} ER eee 
5846 |_____ doeesce Unknown (coarse) ___-____ {ce 3; 635-225! 6567) |. 22222) seeeee | es ee 
5950 | July 1,1904 | World’s Fair exhibit 
(large pieces) -____----__|__-____ O3590 |e 8)52:|_._.£.|_2 2 eee 
5950 }__--- dose us World’s Fair exhibit 
Gine)). 442 2 eee! Shap ee 4:25) |... =2=..|.< a ee 
7080 |_---- do _-_----| Montalban cave_____-_____| 9.54 | 2.01 |______ %..68) |= -25-|-oe2 Se | Sere 
11034 | June 17, 1904 | Caves in Batangas_-______|_-.--__}] 8.51 |_--___ 4.23 |_2_=_-| ee Eee 
11186 | July 14,1904 | Unknown-______-___--_---_| 15.35 | 8.64 |______ 2.58 |... | See eee 
13026 | Oct. 1,1904 | Bat guano from caves 
near Pilar, Capiz (sur- 
fale) Later ee eee sheen | fooeeee PONS t REeenel 4.07'|.-2-22] 525 2c eee 
18026 |_---- dois Bat guano from caves | 
near Pilar, Capiz (1 
meter under surface) ___|_--_--- WPA eee 7.58) |" = 2-3] a eee 
N401G Ree syns sees Unknown sesseeneenc eee eneeee (MPAs ese 4200} 2-. === |eee ae trace 
16710 | Mar. 15,1905 | Bat guano removed from \ 
the roof of a small | 
schoolhouse in San 
Francisco de Malabon, | ‘ | 
Cavite feb= ee saa eee 9.20 | 8.81 |__-___ 5.82 | 2.26 | 1.60 0. 97 
(BEE) eee meet Near Calapan_-_-_-___------- 9F80)|'2:26) |-o= es eal EEE SS) Be 0.67 
4341 debby Sees 1558? |-= oe lees 0.65 
23654 | Oct. 17,1905 | Unknown --__--__----_---- 42.26 | 6.70 |_-_--- 2:40 |.---22])-c See | 
27918 | Feb. 14,1905 |__-_- dostyi2s 2222 2ke ees 6.60 | 0.10 joooo- 8.93 | 0.93 | 2.39 9.10 | 
$2476 | June 27, 1906 
35701 | Aug. 29, 1906 
* This sample contained 32.77 per cent carbon. 
—_— 
