1896.] MICROSCOPICAL JOURNAL. 277 



branch ? Can you recognize a connection between the 

 conidia ? Which conidia do you think are the youngest, 

 and why ? Determine the relation between the row of 

 conidia and the hyphae, are there several to each hyp- 

 hae ? Recognize the branching cells which connect with 

 the hyphae, and the slender tips, sterigmata, which bear 

 the conidia. 



Sow a few conidia in a nutrient medium on a slide, set 

 aside for a few hours in a warm moist place and then 

 examine; you will find the conidia germinating, hyphae 

 of various lengths being sent out from the spherical spore 

 or conidium. 



24. GrENERAL SUMMARY.— What evidence can you cite 

 from the facts thus far learned bearing on the following 

 points: 



(1) Cells not supplied with chlorophyll and not exposed 

 to the action of sun-light require to be supplied with pre- 

 pared nutriment, and cannot thrive in rain-water, while 

 chlorophyll containing cells in the sunlight can make 

 food from the simple compounds found in rain water. 



(2) Motion and sensation, while not absolutely confined 

 to animal cells, are decidedly characteristic of them and 

 commonly nearly or quite wanting in plants. 



(3) Cell growth and reproduction are characteristic of 

 all cells, both animal and plant, and in either may take 

 place by budding or fission. 



(4) Reproduction may produce either solitary cells, 

 which may be either simple or complex, or it may pro- 

 duce groups of cells in which the cells may be either 

 all similar, or with some differentiation, or with consid- 

 erable differentiation. That is, single cells may retain 

 their individuality or they may become subordinate 

 members of larger organizations. 



