IV PrwEFACE. 



Assnming tliat facts in natural history are useless if merely memorized from the book, 

 and that the student must earn his knowledge by observing and experimenting, it is ob- 

 viously best to encourage him at first by showing him how to try simple experiments 

 whose results are easily interpreted. Seeds are the best material for such experiments, 

 since the phenomena connected with their germination are not only easily observed, but 

 deeply interesting. For this reason what may seem a disproportionate space in the Intro- 

 ductory Lessons is devoted to "The Beginnings of Plant Life." There are no lessons of 

 greater educational value than those given to observing eyes by the growth of a plant 

 from the first quickening of the dry embryo to the putting forth of flowers and the ripen- 

 ing of fruit. A sunny window in each school-room should be devoted to these beautiful 

 object lessons of nature. It must not be forgotten, however, that since most young peo- 

 ple are eager to learn the names of plants whose flowers tliey admire, it is best to devote 

 most of the spring months to the study of Sj'stematic Botany. The child's "^Vhatis 

 it?" and the finger pointing to the plant in bloom, show plainly with what to begin the 

 study of botany. Baron Frederick von ^Mueller says in his preface to an elementary 

 work upon the botany of Victoria, Australia: "An experience of nearly forty years has 

 cou\-inced the author that the use of a grammar-like publication for initiating into a 

 study of plants is alike wearisome to teacher and children, and that as a rule, subject to 

 lare exceptions, the knowledge acquired from the . ordinary first elementary works on 

 botany is as quickly lost as gained. The only method of rendering such studies agreeable 

 and lastingly fruitful consists in arousing an interest of the young scholars in the native 

 plants of their locality, to afibrd them all possible facilities to recognize and discriminate 

 all the various plants within reach, to lead them by observations thus started to com- 

 prehend the Imiits of specific forms, of generic and ordinal groups, and to conduct them 

 afterwards to the more difiicult study of special anatomy and physiology of plants." 



Teachei-s and learners are here reminded of the unportance of carefully writing out 

 the details of experiments tried, as well as descriptions of what has been observed. In 

 the words of Dr. Asa Gray: " The naturalist must not only observe that he may describe, 

 but describe if he would observe." 



It will be noticed — and the fact has fonned the basis of a criticism — that the descrip- 

 tions of genera and species in this Flora are very brief; as a rule only the contrasting 

 characteristics being given, since more is calculated to confuse rather than help the be- 

 ginner. Dr. Gray says: "In floras, as in more general works, abridged descriptions or 

 diagnoses suffice — indeed, are preferable in all cases where the region is pretty well 

 explored, and where materials can be thoroughly elaborated." 



Although the Flora is designed especially for students in Central California, it Avill be 

 found only a little less useful to those studying as far south as Los Angeles, or as far 

 north as the Columbia. The Introductory Lessons are suited to the entire Pacific Coast. 



San Fra^'cisco, Januaiy, 1SS2. V. K. 



