November, 1917 



THE GARDEN MAGAZINE 



125 



the nurseries have been 

 raised nearly all the trees 

 and shrubs which now 

 form the outdoor museum, 

 and from them hundreds 

 of thousandsof rare plants, 

 or plants entirely new to 

 cultivation, have been sent 

 out in exchange for other 

 plants, to be tested in al- 

 most every civilized coun- 

 try of the world. In these 

 nurseries, too, have been 

 produced by hybridization 

 a few plants of consider- 

 able value. The Arbore- 

 tum has been fortunate 

 that its nurseries from their 

 beginning until a year ago 

 were managed by Jackson 

 Dawson, a man of genius 

 whogave to the Arboretum 

 his enthusiasm, his im- 

 agination, and unsurpassed 

 knowledge of plants and 

 their propagation. The 

 work of Jackson Dawson 

 was one of the principal 

 factors in the successful 

 creation of the Arboretum 

 and in extending its use- 

 fulness, and in its success 

 he found a happiness which 

 is not given to many men. 

 In the library and her- 

 barium the material gath- 

 ered by agents of the Ar- 

 boretum is studied, and in 

 its library have been pre- 

 pared the books through 

 which the information 

 about trees collected by 

 theArboretum has reached 

 the public. The library 

 commenced in 1873, now 

 contains 31,000 bound vol- 

 umes and 8,000 pamphlets, 

 and on its shelves are to 

 be found all the principal 

 books in all languages re- 

 lating in any way to trees, 

 their uses and cultivation. 

 The herbarium, the foun- 

 dation of which was laid 

 by the agents of the United 



One of the most noticeable trees on the driveway is Cercidiphyllum japonicum which is the largest tree in 

 Japan. Thrives in North Eastern America 



States Census of 1880, has 

 grown and is growing 

 steadily. It is rich in the 

 ligneous plants of North 

 America, and of China and 

 Japan. Those from other 

 countries are fairly well 

 represented, and it is the 

 purpose of those who now 

 administer the Arboretum 

 that this herbarium shall 

 eventually provide mater- 

 ial for the critical studies, 

 begun in North America 

 and continued in Japan 

 and China, of the trees of 

 all other countries. 



Only a few years have 

 been necessary to make 

 the Arboretum what it is 

 to-day, and if we pass in 

 imagination down the cen- 

 turies during which it is to 

 occupy the ground in Bos- 

 ton it now occupies, it will 

 not be difficult, judgingthe 

 future by the accomplish- 

 ment of a few years, to pic- 

 ture an establishment able 

 to increase human knowl- 

 edge and human happiness 

 in all parts of the world. 



The foundations for such 

 an establishment have al- 

 ready been laid. The posi- 

 tion of the Arboretum as a 

 scientific station is now re- 

 cognized. It has many 

 friends who believe in its 

 value, and it has attracted 

 and retained for many 

 years a staff devoted to its 

 interests; and nothing now 

 but insufficient space in 

 which to expand, and in- 

 sufficient money to make 

 possible the work the cen- 

 turies will impose on it, can 

 prevent th; realization of 

 the dreams of those who 

 have found their life'swork 

 in preparing the way for a 

 great scientific and popular 

 establishment of far-reach- 

 ing influence. 



Electricity For Heating Frames 



W. C. McCOLLOM 



A PRACTICAL AND ECONOMICAL METHOD WHERE NO REGULAR HEATING PLANT EXISTS.— POSITIVE FACTS IN 



VIEW OF RISING COSTS OF NATURAL HEATING MATERIAL 



NEVER heard of such a thing!" 

 Probably not. I don't even know 

 that any one has actually done it; 

 but in view of the increasing diffi- 

 culty of obtaining natural heating material, 

 stable manure, the scheme may not be so 

 impractical after all. Let's look at the facts. 

 The price of electricity is tending downward 

 while the price of stable manure is rapidly in- 

 creasing; and in many localities it can hardly 

 be procured under any circumstances. Then 

 why not use electricity for heating hot beds 

 since its cost is not prohibitive? 



The great advantage in using electricity is 

 that we can instantly regulate the heat of the 

 bed according to the weather. At four o'clock 



it is mild; at nine it is freezing briskly. Ac- 

 cordingly we turn on our switch and the hid- 

 den forces of our cleanest and most satisfactory 

 of all heating mediums are set in operation giv- 

 ing us the required degree of heat necessary for 

 the development of the plants in the bed. 

 Just think of it! No manure to cart away; 

 no digging up and littering of the entire sur- 

 roundings nor the disadvantage of having 

 heat when it is not wanted. 



Heating frames by electricity is really a very 

 simple thing. All one has to do is to attach a 

 supply cable of sufficient size from the point of 

 intersection with the main feed cable to heaters 

 which are placed in the frames at equal dis- 

 tances from each other. These heaters which 



are made of castings of metals or a composi- 

 tion of metals that offer resistance enough 

 to the electric current to generate heat are 

 not more than one half inch thick and have 

 small lugs at the corners to keep them from 

 coming in contact with the supporting rear 

 wall to which they are attached about six 

 inches above the ground line inside the frame. 



The Question of Cost 



RASING our calculation of cost on a frame 

 -*-' six feet wide and fifty feet long with one 

 foot of exposed wall in front and two feet in 

 the rear, the customary way of building 

 frames, we get a total of #80.00 divided as 

 follows: Three heaters of the gridiron type, 



