452 



• THE BE G INNINGS OF LIFE. 



watch-glass as soon as its upper surface was wetted. This 



App 



Experiment 1. A solution containing twelve grains of 

 .iron and ammonic citrate (mixed with a few very mi- 

 nute fibres of deal wood) in one ounce of distilled water. 



The flask was opened at the commencement of the 



fortnight, though previous to this the amount of sedi- 

 ment had gradually increased. After the second or 

 third exposure the previously dark brown fluid became 

 fluorescent— black to reflected, but olive-coloured to 

 transmitted light. There was also a brownish deposit 

 on one side of the tube. When the flask was opened 



found that the vacuum was almost wholly 



it was 



impaired, by an 



internal evolution of gas 



On 



microsco 



multitudes 



aggregated into flakes, were seen. There were no dis- 

 tinct Bacteria, though large numbers of the rounded and 

 ovoid organisms similar to those met with in Exps. 9 

 and 12, were intermixed with the granules. They were 

 partly separate, partly in groups of fours and eights. 

 They varied considerably in size, and also in colour 

 some being decidedly greenish, and others quite yellow 

 and faded. In the granular aggregations, different stages 

 in the growth of these Desmid-like bodies were to be 

 recognized. What appeared to be short Leptothrix fila- 

 i-^ :^ J r^^.-^ oom^ r>f fVip crranular masses. 



r0^ 



for t«'0 ^ - 

 then found 



seventh week from the date of preparation. It was .^j^^j ^xperimei 

 exposed to sunlight for about eight days during the last [^^^^^^^^ the '. 



Ited) were see 

 0£ or^nisr 

 ; ij the last sol 



appearanc 

 io great varia 

 '■ in length, w] 



'in length. S 



a' 



SiilH 



i 





le 



'^Parate 



ere 



el 

 ^ere 



t- 



