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NOTICE. 
Attention is called to the PATENT BUILDING BLOCKS, now extensively used in New York City, and in proccss of introduction into this State. Cement blocks were first made in this State, by HENRY WOOD, of Wellesly, Mass., and have been manufactured by him together with the undersigned upon a limited scale for some time. The building blocks have been most thoroughly brought to public notice in the city of New York, where they are in such demand that the manufacturers of them received orders for more than a million of them in excess of their large capacity for production during the past year. It is claimed for them that they excell the red clay brick in form, beauty, cheapness, strength and durability. 
FORM. 
The blocks or bricks are ten (10) inches long, five (5) inches wide and four (4) inches high, with a perpendicular hole through them six (6) inches long and one and one-eighth (1 1-8) inches wide. This hole is made for the purpose of keeping out dampness and frost, and when laid properly the holes connect, making a dead air space through the entire walls. Each block takes the place of three and one-eighth (3 1-8) red bricks, and contains two hundred (200) cubic inches. 
[[seal]] THE NATIONAL ARCHIVES OF THE UNITED STATES [[\seal]] 
BEAUTY. 
 Their faces are smoothly finished, and all the lines are straight and sharply defined. The most common color is that of hammered granite, and so close an imitation to this stone can be made that the block can be distinguished from it only by its superior finish and beauty. The granite colored blocks laid with white lime mortar make a very beautiful building.  By the introduction of colored sands and coloring matter, any desired color my be given to the blocks, and thus any stone may be successfully imitated, and in every case the building made from it will excell in beauty of finish, any made of stone which is imitated. 
CHEAPNESS. 
The blocks made in this State by Henry Wood have, up to this time, been sold at from $50 to $60 per thousand (M), and the undersigned was unable the past season to fill the orders received. 
The Patent Blocks are sold in New York at thirty-five dollars ($35) per thousand, and this price pays a most satisfactory profit to manufacturers. As each brick or block is as large as three and one-eighth (3 1-8) red bricks, it will be readily seen that there is no question as to the superior cheapness of the PATENT BLOCK. It is also worthy of notice that a mason can, in a given time, lay from one-third (1-3) to one-half (1-2) more surface in consequence of their greater size, and at a saving of at least one-half (1-2) the mortar. 
STRENGTH AND DURABILITY. 
 The material used in the blocks has a chemical affinity for the mortar used in laying them and they cling together much more firmly than red brick or stone, consequently walls built of them are