APPENDIX A. 



vn 



encountered in the same solution with the Sarcina and spiral 

 fibres, partly free and partly in intimate connection with the 

 latter (Fig. e). The spiral-fibre masses have been seen also 

 in different stages of growth. In some of the solutions of 

 ammonic tartrate minute masses have been seen which were 

 obviously young fibres, the ultimate element of some of these 



Embryonic Spiral Fibres met with in a solution of Ammonic 



Carbonate and Sodic Phosphate. ( x 600.) 

 a. Amorphous granules in an almost transparent matrix. 

 b, b. Formation of embryonic fibres by a differentiation of a 

 more finely granular matrix. 



c. Similar fibres more fully formed. 



d. !Torw/a-cells from same solution. 



being excessively minute and inextricably twisted. Very 

 peculiar embryonic-looking fibres closely related to them 

 have also been found in an ammonic carbonate solution l . 



1 In four or five subsequent attempts to produce similar fibres in 

 carbonate of ammonia solutions, I have met with no success. In the 

 first experiment an unknown quantity of the saline materials was dis- 

 solved in some of the West Middlesex water. Even if the quantities 



