SYSTEMATIC SYNTHESIS OF TISSUES. 167 



first place, be kept at a temperature of about 100, and, 

 in the second place, be acted on by a minute portion of 

 animal tissue already appropriately compounded. 



97. THE CHEMICAL INFLUENCE OF THE HEAT WITH 



THE ANIMAL INFLUENCE OF THE TISSUE will SOOU begin 



to work like leaven, and first one variety of tissue and 

 then another will start into existence, each also growing 

 by additions to itself, till all the varieties of Tissue are 

 formed in proper proportions, and all the contents of 

 the shell are changed into tissues, and a perfect chicken 

 appears. 



98. IF THE CHARACTER OF THE MINUTE PORTION- OF 

 TISSUE IN THE EGG BE EXAMINED, it will afford much 



instruction upon the important subject of the constitu- 

 tion of the tissues. 



99. IF AN EGG-SHELL BE CAREFULLY CUT OPEN, the 



yolk will be seen suspended, so that a very easily dis- 

 cerned spot upon its surface is always uppermost. 



100. IF THIS SPOT IS EXAMINED WITH A MICROSCOPE, 



, 



a minute cell or sac will be found, formed of an albumin- 

 oid substance as thin as that of the thinnest soap-bubble, 

 and called homogeneous, viz., alike in its character 

 throughout. 



101. THE CELL CONTAINS a liquid substance, in the 

 midst of which float minute, irregular collections of mat- 

 ter called granules ; of what, or how, they are composed, 

 is not certain. 



102. THE SUBSTANCE OF THE WALLS OF THE CELL IS 



of such a nature, that materials can pass into and out 

 from the cell very freely, the substance- wall of the cell 

 having very little tenacity, and seeming to serve its 

 purpose by surrounding its contents rather than by en- 

 closing them. 



103. AT ONE OR MORE POINTS IN THE WALLS OF 



SUCH CELLS there is a peculiar construction called its 



97. What said of ? 98. What if ? 99. What ? 100. What ? 101. What 

 does ? 102. What is ? 108. What is ? 



