XIV TO THE TBACHEK. 



references. Exercises to be conducted out of school hours 

 may be assigned at the discretion of the teacher, but 

 generally it will be found that the best work is done in 

 the laboratory under his personal direction. 



In the majority of preparatory schools half a year is 

 given to botany. It is very desirable that the time should 

 be extended, but until this is done it is recommended 

 that the exercises be followed substantially as here out- 

 lined, with the omission of a part, or possibly the whole, of 

 the microscopic work. If the latter is undertaken, and a 

 reasonable amount of time is given to the study of different 

 families of plants in the spring, a full year will be needed. 



It has been found impossible to introduce some desirable 

 changes that have been suggested by teachers without un- 

 duly increasing the size of the book, but it is hoped that 

 those who use it will feel the greatest freedom in omitting 

 what seems better left out, in adding exercises not here 

 provided for, and in the distribution of time. It is only 

 by such a free exercise of one's own judgment that the 

 best results are attained. 



