vin 



CELLS AND OEGANISATIONS 



Cells Their Construction, Multiplication, and Modification 

 Egg-Cells The Building up of Animal Forms Greatness of 

 the Work Mind in it Wealth of Order in the Cells. 



THE simplest living forms consist of globules of proto- 

 plasm. The next in the ascending scale are cells. They 

 are made of an outer substance, in a state between the 

 fluid and the solid, and an inner called the nucleus, which 

 is more solid than the first. Both are albuminous in 

 their nature. They are the two essentials in the consti- 

 tution of cells. They take in fatty particles, crystals, 

 colouring matter, and various substances ; but these are 

 not necessary to their peculiar powers of action. The 

 cells of plants have, besides, generally a membrane as a 

 wall enclosing them. 



When the various parts of plants and animals are 

 examined, they are found to consist of cells. The grass 

 of the field, the leaves of the forest, the flowers of the 

 garden, and the fruits of the orchard are built of cells. 

 The flesh and blood and bones of animals are composed 

 of the same elemental forms. Nerve cells are specially 

 complex in their nature. The ganglion cells of the 

 brain surpass in complexity, and are magnificent adapta- 

 tions for their work. 



There are many one-celled organisms, as the amoebee, 

 desmids, diatoms, etc. They are found principally in 



